chore: add desc to README

README.md

@@ -7,6 +7,27 @@
 
 Tool for reporting Slashings and Withdrawals for Lido Community Staking Module
 
+### Daemon working mode
+
+The tool is a daemon that listens to the CL and reports any slashings and withdrawals to the Lido Community Staking Module.
+
+The algorithm is as follows:
+0. Get the current CL finalized head.
+1. Run `KeysIndexer` service to get the current validator set of the CS Module.
+   > It is necessary at the first startup. All subsequent runs of the indexer will be performed when necessary and independently of the main processing*
+2. Choose the next block service to process from `RootsProvider`.
+   > The provider chooses the next root with the following priority:
+   > - Return the root from `RootsStack` service if exists and `KeyIndexer` is helthy enougth to be trusted completely to process this root
+   > - *When no any processed roots yet* Return a configured root (from `.env` file) or the last finalized root
+   > - Return a finalized child root of the last processed root
+   > - Sleep 12s if nothing to process and **return to the step 0**
+3. Run `RootsProcessor` service to process the root.
+   > The processor does the following:
+   > - Get the block info from CL by the root
+   > - If the current state of `KeysIndexer` is outdated (~15-27h behind from the block) to be trusted completely, add the block root to `RootsStack`
+   > - If the block has a slashing or withdrawal, report it to the CS Module
+   > - If the current state of `KeysIndexer` is helthy enougth to be trusted completely, remove the root from `RootsStack`
+
 ## Installation
 
 ```bash